The German Blog Docma (translation here) is the first site testing the new Sigma 135mm f/1.8 on the Sony A7rII. Their conclusion is:
1) the mild Background effect is (almost) unique and perfect for “full body” Model Shooting.
2) The lens shows no compromise in any area
3) The Bokeh is very harmonic and shows no artifacts
4) the lens is sharp from edge to edge even at f/1.8 aperture.
Sigma 135mm f/1.8 lens at BHphoto Adorama.
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Found via Dpreview forum